73ventura

thanks for the feedback. i do have the #46 heads on the 350. the 455 is all original/stock and the # 15 heads may be fine for what i want. I thought the 6x-8 heads would have the hardened seats and big valves, but hate to lose that much compression i really just want a dependable streetable engine at 400 hp. I let someone talk me out of a set of 69 #16's. i may be just as well off if i just clean up the heads and intake, good valve job , decent cam and exhaust and go play. i'm going to keep the power brakes,a/c,etc. At my age, i just want to "Light 'em up" now and then.

i've had a 73 ventura with a 350 sitting in the shop a couple of years and today i bought a 455 from a 70 Bonneville. everything shows this YH block to be the 360 hp rated engine with 2 bolt main and it has the #15 heads. I have a set of 6x-8 heads from a 77 400 and wondered how low the compression is going to go if i run those heads. The 6x have the 2.11 valves with dual springs and i think they will flow better, but i would like to keep this 455 pushing 400 HP. I haven't decided on a cam yet until if find more info on which heads to run